(2 pack) HTH Liquid Solar Blanket — Liquid, 28 fl oz — Pool Chemical Water Evaporation Reducer to Save Water and Heat

Forms a tough, invisible barrier that prevents heat loss and conserves water. Reduces heat loss by up to 40% due to evaporation. Replaces the need for an expensive solar pool cover. Easy to use and convenient. Swim within 15 minutes Compatible with all swimming pools, including salt water pools.